lily/tex-slur.cc

   1 /*
   2   tex-slur.cc -- implement Lookup::*slur
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1996,1997 Han-Wen Nienhuys <hanwen@stack.nl>
   7 */
   8
   9 #include <math.h>
  10 #include "main.hh"
  11 #include "misc.hh"
  12 #include "lookup.hh"
  13 #include "molecule.hh"
  14 #include "dimen.hh"
  15 #include "debug.hh"
  16 #include "paper-def.hh"
  17 #include "string-convert.hh"
  18
  19
  20 static char
  21 direction_char (Direction y_sign)
  22 {
  23   char c='#';
  24   switch (y_sign)
  25     {
  26     case DOWN:
  27       c = 'd';
  28       break;
  29     case CENTER:
  30       c = 'h';
  31       break;
  32     case UP:
  33       c = 'u';
  34       break;
  35     default:
  36       assert (false);
  37     }
  38   return c;
  39 }
  40
  41 Atom
  42 Lookup::half_slur_middlepart (Real &dx, Direction dir) const
  43 {
  44   // todo
  45   if (dx >= 400 PT)
  46     {
  47       WARN<<_("halfslur too large") <<print_dimen (dx)<< _("shrinking (ugh)\n");
  48       dx = 400 PT;
  49     }
  50   int widx = int (floor (dx / 4.0));
  51   dx = widx * 4.0;
  52   if (widx) widx --;
  53   else
  54     {
  55       WARN <<  _("slur too narrow\n");
  56     }
  57
  58   Atom s;
  59
  60   s.dim_[Y_AXIS] = Interval (min (0, 0), max (0, 0)); // todo
  61   s.dim_[X_AXIS] = Interval (-dx/2, dx/2);
  62
  63   String f =  String ("\\hslurchar");
  64   f += direction_char (CENTER);
  65
  66   int idx = widx;
  67   if (dir < 0)
  68     idx += 128;
  69
  70   assert (idx < 256);
  71
  72   f +=String ("{") + String (idx) + "}";
  73   s.tex_ = f;
  74   s.translate_axis (dx/2, X_AXIS);
  75
  76   return s;
  77 }
  78
  79 /*
  80    The halfslurs have their center at the end pointing away from the notehead.
  81    This lookup translates so that width() == [0, w]
  82  */
  83
  84 Atom
  85 Lookup::half_slur (int dy, Real &dx, Direction dir, int xpart) const
  86 {
  87   Real orig_dx = dx;
  88   if (!xpart)
  89     return half_slur_middlepart (dx, dir);
  90
  91   int widx;
  92
  93   if (dx >= 96 PT)
  94     {
  95       WARN << _("Slur half too wide.") << print_dimen (orig_dx) << _(" shrinking (ugh)\n");
  96       dx =  96 PT;
  97     }
  98
  99   widx = int (rint (dx/12.0));
 100   dx = widx*12.0;
 101   if (widx)
 102     widx --;
 103   else
 104     {
 105       WARN <<  _("slur too narrow ") << print_dimen (orig_dx)<<"\n";
 106     }
 107
 108   Atom s;
 109   s.dim_[X_AXIS] = Interval (0, dx);
 110   s.dim_[Y_AXIS] = Interval (min (0, dy), max (0, dy));
 111
 112
 113   String f = String ("\\hslurchar");
 114
 115   f+= direction_char (dir);
 116
 117   int hidx = dy;
 118   if (hidx <0)
 119     hidx = -hidx;
 120   hidx --;
 121   int idx =-1;
 122
 123   idx = widx * 16 + hidx;
 124   if (xpart < 0)
 125     idx += 128;
 126
 127   assert (idx < 256);
 128   f+=String ("{") + String (idx) + "}";
 129
 130   s.tex_ = f;
 131
 132   return s;
 133 }
 134
 135 Atom
 136 Lookup::ps_slur (Real dy , Real dx, Real ht, Real dir) const
 137 {
 138   String ps = "\\embeddedps{\n";
 139
 140   ps += String_convert::double_str (dx) + " "
 141     + String_convert::double_str (dy) + " "
 142     + String_convert::double_str (ht) + " "
 143     + String_convert::double_str (dir) +
 144     " draw_slur}";
 145
 146   /*
 147    slurs are rarely wider than 100pt:
 148    precision of 3 yields maximum (slur spanning page)
 149    error of: 1%% * 6*72pt === 0.4pt = 0.14 mm
 150    */
 151   String dx_str = String_convert::precision_str (dx, 4);
 152   String dy_str = String_convert::precision_str (dy, 3);
 153   String ht_str = String_convert::precision_str (ht, 3);
 154   String dir_str = String_convert::int_str ((int)dir);
 155   String name = "feta-sleur-" + dx_str + "-" + dy_str + "-" + ht_str + "-" + dir_str;
 156   int i = name.index_i ('.');
 157   while (i != -1)
 158     {
 159       *(name.ch_l () + i) = 'x';
 160       i = name.index_i ('.');
 161     }
 162
 163   String mf = "\\embeddedmf{" + name + "}{\n";
 164   mf += "mode_setup;\n";
 165   mf += "staffsize\\#:="
 166     + String_convert::int_str ((int)paper_l_->get_var ("barsize"), "%d")
 167     + "pt\\#;\n";
 168   mf += "interline#:=staffsize#/4;\n";
 169   mf += "stafflinethickness#:=0.1interline#;\n";
 170   mf += "input feta-sleur;\n";
 171   mf += "slurchar(" + dx_str + "," + dy_str + "," + ht_str + "," + dir_str + ");\n";
 172   mf += "end.\n";
 173   mf += "}\n";
 174
 175   Atom s;
 176   s.tex_ = ps + mf;
 177   return s;
 178 }
 179
 180 Atom
 181 Lookup::tex_slur (int dy , Real &dx, Direction dir) const
 182 {
 183   assert (abs ((int)dir) <= 1);
 184   Atom s;
 185   Direction y_sign = (Direction) sign (dy);
 186
 187   bool large = abs (dy) > 8;
 188
 189   if (y_sign)
 190     {
 191       large |= dx>= 4*16 PT;
 192     }
 193   else
 194     large |= dx>= 4*54 PT;
 195
 196   if (large)
 197     {
 198       s = big_slur (dy, dx, dir);
 199       return s;
 200     }
 201   Real orig_dx = dx;
 202   int widx = int (floor (dx/4.0)); // slurs better too small..
 203   dx = 4.0 * widx;
 204   if (widx)
 205     widx --;
 206   else
 207     {
 208       WARN <<  _("slur too narrow: ") << print_dimen (orig_dx) << "\n";
 209     }
 210
 211   int hidx = dy;
 212   if (hidx <0)
 213     hidx = -hidx;
 214   hidx --;
 215   if (hidx > 8)
 216     {
 217       WARN<<_("slur to steep: ") << dy << _(" shrinking (ugh)\n");
 218     }
 219
 220   String f = String ("\\slurchar") + String (direction_char (y_sign));
 221
 222   int idx=-1;
 223   if (y_sign)
 224     {
 225       idx = hidx * 16 + widx;
 226       if (dir < 0)
 227         idx += 128;
 228     }
 229   else
 230     {
 231       if (dx >= 4*54 PT)
 232         {
 233           WARN << _("slur too wide: ") << print_dimen (dx) <<
 234             _(" shrinking (ugh)\n");
 235           dx = 4*54 PT;
 236         }
 237       idx = widx;
 238       if (dir < 0)
 239         idx += 54;
 240     }
 241
 242   assert (idx < 256);
 243   f+=String ("{") + String (idx) + "}";
 244   s.tex_ = f;
 245   s.translate_axis (dx/2, X_AXIS);
 246   return s;
 247 }
 248
 249 Atom
 250 Lookup::big_slur (int dy , Real &dx, Direction dir) const
 251 {
 252   if (dx < 24 PT)
 253     {
 254       warning (_("big_slur too small ") + print_dimen (dx) + _(" (stretching)"));
 255       dx = 24 PT;
 256     }
 257
 258   Real slur_extra =abs (dy)  /2.0 + 2;
 259   int l_dy = int (Real (dy)/2 + slur_extra*dir);
 260   int r_dy =  dy - l_dy;
 261
 262   Real internote_f = paper_l_->internote_f();
 263   Real left_wid = dx/4.0;
 264   Real right_wid = left_wid;
 265
 266   Atom l = half_slur (l_dy, left_wid, dir, -1);
 267
 268
 269   Atom r = half_slur (r_dy, right_wid, dir, 1);
 270   Real mid_wid = dx - left_wid - right_wid;
 271
 272   Molecule mol;
 273   mol.add (l);
 274   Atom a (half_slur (0, mid_wid, dir, 0));
 275   mol.add_at_edge (X_AXIS, RIGHT, a);
 276   mol.add_at_edge (X_AXIS, RIGHT, r);
 277
 278   mol.translate_axis (l_dy * internote_f, Y_AXIS);
 279   Atom s;
 280   s.tex_ = mol.TeX_string();
 281   s.dim_ = mol.extent();
 282   return s;
 283 }
 284
 285
 286 Atom
 287 Lookup::slur  (Real &dy_f , Real &dx, Real ht, Direction dir) const
 288 {
 289   if  (dx < 0)
 290     {
 291       warning (_("Negative slur/tie length: ") + print_dimen (dx));
 292       dx = 4.0 PT;
 293     }
 294   Atom s;
 295
 296   if (postscript_global_b)
 297     s = ps_slur (dy_f, dx, ht, dir);
 298   else
 299     {
 300       Real nh =  paper_l_->internote_f ();
 301       int dy_i = (int) rint(dy_f / nh);
 302
 303       s = tex_slur (dy_i, dx, dir);
 304       dy_f = dy_i *  nh;
 305     }
 306
 307   s.dim_[X_AXIS] = Interval (0, dx);
 308   s.dim_[Y_AXIS] = Interval (0 <? dy_f,  0 >? dy_f);
 309   return s;
 310 }